don't scroll current tasks off screen

[escapewindow]

Given a 3000+ task view, sometimes I find the task I care about before the entire task graph is loaded. Then I click on it to view it, but right before I click, 100 more tasks load and the task shifts off screen, and I click on a different task. Then I have to go back, and find the task, and either wait for all 3000+ tasks to load, or try the task-click-lotto again.

I'd love if we could load the tasks in the background but keep the current scroll position fixed. I'm not sure if this is possible... maybe if we had a sort-by-latest-loaded instead of a default sort-by-alphabetical-label? but ideally it would keep sorting, but increase the above- and below- screen buffers rather than shifting the view down or up.

[escapewindow]

#284 will probably help, since I would have fewer tasks to sort through to find the one I want.